By B.D. Harrison, A.F. Murant
This 5th quantity within the sequence The Plant Viruses, facing viruses with bipartite genomes, completes the assurance of viruses with isometric parti cles and genomes together with single-stranded, positive-sense RNA: viruses that experience tripartite and monopartite genomes of this sort have been handled in Volumes 1 and three, respectively. How shut are the affinities one of the viruses in the groupings wonderful during this method? All people with tripartite genomes are thought of to be sufficiently heavily on the topic of be incorporated within the kinfolk Bromoviridae, while the monopartite-genome viruses coated in quantity three truly are a way more various assortment. Affinities one of the viruses with bipartite genomes are thought of in bankruptcy 1 of this quantity, besides the potential origins, benefits, and downsides of those ge nomes. the belief reached from this review is that the bipartite genome viruses fall into 4 different types, these inside of each one class having nearer affinities with viruses now not integrated during this e-book than with viruses within the different different types. No facts was once chanced on that ownership of a bipartite genome provides a scourge overwhelming merits over viruses of different types. extra most likely, any merits are mostly balanced through negative aspects, and bipartite genomes can be most sensible thought of easily as a substitute layout for the hereditary fabric of a virus.
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Extra info for The Plant Viruses: Polyhedral Virions and Bipartite RNA Genomes
Sample text
The only nonlegume hosts are Chenopodium amaranticolor and C. quinoa, both of which develop local lesions, severe systemic vein yellowing, and leaf distortion. The type isolate of GMV from New South Wales reacted weakly with antisera to BBTMV, BBSV, and SMV. In addition, the GW strain from Queensland reacted weakly with antisera to CPMV, CPSMV, BPMV, and RCMV. The type isolate and the GW strain could be distinguished from each other by formation of a small spur in agar double-diffusion serological tests.
Lin et al. (1981a), however, found several isolates of CPSMV that produced systemic symptoms in C. amaranticolor. Similarly, whereas most strains of bean pod mottle virus (BPMV) remain localized in C. quinoa, Moore and Scott (1971) encountered an isolate that produced a bright yellow systemic mottling in this host. Nelson et al. (1965) described an isolate of SMV that caused systemic infection of watermelon, whereas the type isolate does not infect watermelon. Many other examples exist of variation in host reaction among isolates of a comovirus.
When CsCI equilibrium gradients are utilized, one should be aware that at (even slightly) alkaline pH the B components of several comoviruses split into two forms that differ in buoyant density but still have the same biological activity (Bruening, 1977). , 1985). C. Particle Proteins 1. Comoviruses Have Two Different Capsid Proteins Comoviruses are distinguished from most other small isometric plant viruses in having two types of capsid protein, which occur within the capsids in a ratio of 1:1 (Wu and Bruening, 1971; Geelen, 1974).